My first three letters, the carrier of ink. I am black and white, waddling on the rink.

I'm known for throwing or singing, but never both. I'm taken in rooms with long tables and marked in yards and heard in hertz If I'm not on the mound, you might hear me rising in the choir.

I have an eye but cannot see. I am a cure or a curse depending on what’s inside of me. I’m impossible to find in a stack of hay, but A camel might fit through my eye some say.

Beginning with procedure chemical for curls increased And ending with parameters for task to be complete But really I'm consent or sanction, from authority

I am the longest in a set. I am an insult. I am central. I am part of you. What am I?